Apparatus for applying waterproofing material to sheets



Aug. 13, 1929. 1.. KIRSC'HBRAUN ET AL APPARATUS FOR APPLYING WATERPROOFING MATERIAL TO SHEETS Filed March 9, 1925 1171/; n fol ester kfrs cl: razln use ot a atv Patented Aug 13, 1929.

i1 NITED STATES 1,724,137 PATENT OFFICE.

L'ERTEB KIRSCHBBAUN, OF CHICAGO, ILLINOIS, AND CHESTER 3. MACDONALD, OF

MIDDLETOWN, OHIO; SAID MACDONALD ASSIGNOR TO FLINTKOTE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

APPARATUS roa APPLYING wnrnnrnoorme murmur. to ensure.

Application filed llarcli 9, 1925. $crial No. 13,995.

s invention relates to improvements in apparatus for applying waterproofing mate rial to sheets, and refers more specifically to a specific type of roll utilized for apply a ing a waterproofing material, for instance in eniulsion or suspension form to the sur of wet plies or paper termed on a multicylinder paper machine, or Jim? the purpose oi applying such waterproofing inata terial whether in emulsion term-or not, to

the nurture of fabric or other sheet material whether wet or dry. a

lit has h hound in actual use that the specific type'oit application roll described in in the following specification possesses many advantages, among which may be cited the uniformity with which it is possible to up ply a liquid oi waterproofing material to a wet or dry sheet, thus resulting in the am urn amount of waterproofing material and uniform. distribution throughout the 1m 1 product.

lln the specific boom the present invention, the roll consists of acyder core at upon whi is' arranged a nicer oi spirally wound wires, Eapaced transversely across the surface of the roll and disposed upon the spiral winding wires, are a plurality of spacing or bacmfng rods. A screen of suitat the 1: a just described, forms a unit adapted to be rotated in a bath; of the waterproo li tpuid, the screen being adapted to contact the surface of the sheet to which it is desired apply the liquid Waterproofing terial,

lln a previous application filed by me,- herial No. 582,303 filed on August 6th, ltlhil, the general process of applying emulsion has heen set forth.

dill

llhis earlier application discloses a va-.

riety oi? alternate methohof roll application whereby in some instances a wooden or solid roll is employed, and as another alternative, a wire covered roll is employed. I

Practical commercial operations have shown that while the solid rolls can he used oil able wire mesh is wound about the outside grods. The entire construction to apply the waterproofing material in larger quantities, better regulated, and. in a much more uniform manner.

in coercial operation, with a wire covered roll in which the wire lacing was applied directly to the solid core, it was found that there would be a tendency for the canal sion to be concentrated in streaks, even when the wire surface was spaced somewhat from the solid; core by means oi circumferentially arranged spacmg wires. There would he a tendency tor a drop or stream of the emulsion to follow the spacing wire and cause a heavier dcposition of emulsion on those portions of the sheet opposite to the contacting surface atthese points. The re sult was to produce a sheet in which there appeared a plurality of longitudinal streaks till Y in which of course, there was a heavier deposition of the waterproofing material. On the heavier paper, this did not make much difi'erenoe, but on lighter paper when. the product was passed through the calendcrs, the diil'crence in caliper due to the elevation of the streaks would cause calender pressure to be concentrated upon these high points, producinga streaked final product.

The moisture-proofing value obtained was not at maximum eficiency, as a much larger amount of waterproofing emulsion was rcquired to be used than if the emulsion was applied uniformly.

Careful observation of the operation of both the solid rolls and, wire covered rolls indicated that the cause of this streah'ng was due to the suction between the wet web and the surtace of the wire covered roll, that is, as the wet sheet left the roll, there was a certain or of cohesion due to suction which concentrated a surface of waterproofing emulsion into a continuous droplet, which latter would persist-in the nip between the sheet and-the following side or the roll. The roll of the present application was designed to obviate this difficulty.

In the drawings, Fig. 1 is a top plan view partly in section of my invention, Fig. 2 is a cross sectional view on lined-52 of Fig. 1L Fig. 3 is an enlarged cross sectional view of the roll.

Referring in detail -wires 23. Transversely of t designates a vat having the transverse partition walls.2, and provided with a longitudinal baflle 3 held in place by means of the'lugs 4. Inlets 5 controlled by valves 6 discharge water into the end compartments formed by means of the transverse partitions 2, the use of which will be hereinamount of the emulsion introduced through the pipe 7 is carefully regulated.

The roll designated as a whole 9, is mounted on shaft 10, which shaft is provided with the bearings 11 in the exterior side walls of the box 1, and with the bearings 12 in the transverse partitions 2. The shaft projects beyond one end of the side wall of the box 1, and is provided with the cone 13, the exterior of the shaft 10 being provided with the bearing 14. An endless belt or pulle 15 contacts the surface of the cone 13, whic belt or pulley also contacts the surface of an oppositely disposed cone 16, providing a standardtype' of changedspeed. The lever 17 is provided which may be manually manipulated for changing the speed of the shaft 10 during the operation. The pulley 16 is mounted on the shaft 18 which bearings '19, and provided interior the bearings with the pulley wheel 20 and belt 21 communicating with any source of driving power, preferably in coordination with the paper machine.

Referring now more particularly to Figs. 1 and 3, in the present instance, the shaft 10 is shown as being surrounded with the core 22. On the exterior surface of the core 22 are arranged a series of s irally wound he circumference of the cylinder 22 and superposed on top of the wire 23, are a plurality of uniformly spaced rods 24 overwhich is adapted to he s read ascreen 25 of suitable wire mesh. e have found 14. mesh wire to be generally satlsfactory. The rods 24 are preferably rectangular in shape, so that their contact with the surface screen 25 is only upon the smallest point. Otherwise, there would be a tendency for an excex of llquld to collect in the meshes of said screen at .the pomt of contact between the supporting surface and the screen itself.

The dam 3 ma be composed of a plural- It] of p1eces,an the level of the emulsion mamtalned in the vat or box may be thus controlled. An execs is withdrawn throu h the outlet 26. As shown specifically in Fig.

2, the wet web designated as 27, carried on blanket 27 which has 'ust'been formed on 'a cylinder mold is f upwardly and the screen, surface 25 of the roll 9 lightly contacts the under surface of said'wet web to apply the liquid waterproofing material thereon in a uniform film.

' The roll 28, the tension of which is adjustable by means of the screw 28', is provided to insure light and constant contact. A layer of such waterproofing material is designated at 29.

The purpose of the present invention is effected not only by the spacing away of the screen 25 from the core so as to permit free access of air to the under side of said screen 25, but also to the particular positioning of the winding wires 23 and rods 24. The effect of the spiral winding of the wires is to cause an even distribution of the emulsion and the transverse positioning of the rods 24 breaks up any tendency to streak formation. It is apparent that if the supporting surface should be circumferential] y disposed about the core, there would be a tendency for the continuous formation of a streak, whereas, if the supporting surface is arranged transversely of the core, the tendency to streak formation is interrupted, as there is no continuous circumferential point or path of contact.

Another feature of the present invention is the provision of mechanism for maintaining the hearings in a satisfactory operat. ing condition, which is accomplished by maintaining a pool of water in the end compartments 30 formed in the vat 1 by means of the transverse partitions 2. This pool of water is maintained at a somewhat greater elevation than the emulsion inside the compartment 31 of the vat, in order that a slight trickle of water may penetrate the bearings 12 into the emulsion, keeping those bearings .clean, whereas, if the liquid level in the compartments 30 was lower than the level in compartment 31, the emulsion would penetrate through the bearings 12 in an opposite direction, resulting in the bearings being broken down due to frictional contact, which causes same to stick and dry.

It is understood of course, that the emulsion may be introduced in any suitable manner to the compartment 31. It is obvious of course, that increasing the height of the dam 3, the liquid level in the com artment 31 is increased, resulting in app ying increased amounts of emulsion to the surface of the roll. It is'obvious of course, that instead of using a solid core which is preferable, a hollow roll somewhat like a dandy or spider roll can be utilized, so lon as the scheme of spacing f the spiral win ing wires and backing rods, is carried out.

We claim as our invention:

1. Apparatus for applying waterproofing liquid to sheets, com using a core mounted on a rotatable shaft, winding .wires disposed circumferentially around the core,

wearer spacing elements superposed on the inding Wires and extending in a direction substantially transverse of the core and a sheet of Wire mesh disposed on. the exterior of said spacing elements.

2. Apparatus for applying Waterproofing liquid to sheets, comprising a core mounted on a rotatable shaft, Winding Wires spirally disposed circumferentially around the core,

angular spacing elements superposed on the Winding Wires and extending in a direction suhstantially transverse of the core-and a sheet of Wire mesh lacing disposed on the exterior of said spacing elements, said angular elements so arranged that they contact the wire mesh facing at their apex.

3. Apparatus for applying Waterproofing liquid to sheets, comprising a solid core mounted on a rotatable shaft, Winding Wires disposed circumferentially around the core, spacing elements superposed on the Wind- 'ing Wires and extending in a direction suhstantially transverse of the core and a sheet of Wire mesh disposed on the exterior of said spacing elements.

4. An apparatus for applying Waterproot ing liquid to sheets, comprising a support mounted on a rotatahle shaft, non-meshed Winding Wires disposed circumierentially around said support, spacing elements super posed on the Winding Wires and disposed at an angle to the Winding Wires, and a foraminated facing disposed on the exterior of said spacing elements.

5. An apparatus for applying Waterproofing liquid to sheets, comprising a support mounted on a rotatable shaft, nonmeshed winding Wires disposed circumterentially around said support, spacing elements superposed on the winding Wires, and a foraminated facing disposed on the exterior of said spacing elements, said spacing elements being angular in cross section and disposed so that they contact a toraminated facing on an edge.

LESTER KIRSCHBRA'UN, GHESTER R. MACDONALD. 

